4-Letter Words Matching _U_L

There are 20 4-letter words that match _U_L. 18 are common words, such as BULL and BURL. A rarer one is NURL. In this set, L is the most frequent open letter (10 words). 10 words contain a doubled letter.

Full list 20

bullburlcullcurldualdueldullfuelfullfurlgullhullhurllullmullnullpullpurlbuhlnurl

About this list

Words
20 (18 common words)
Common example
bull
Rare example
nurl
Doubled letters
10
Ending in S
0
Most frequent letter
L (10)

Questions

How many 4-letter words matching _u_l are there?

20. 18 of them are common words.

What is a common example?

BULL is among the common words in this set.